Accrued Liabilities and Other Long-Term Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accrued liabilities
Accrued property, plant and equipment	$ 324,641	$ 276,402
Interest	52,683	38,647
Product and operations	24,505	33,501
Taxes (other than income tax)	11,528	10,168
Employee compensation	11,377	15,356
Other	13,113	16,104
Total accrued liabilities	437,847	390,178
Other long-term liabilities
SMR liability	87,113	89,592
Deferred revenue	55,621	33,139
Asset retirement obligation	9,996	8,469	6,745
Other	3,770	3,061
Total other long-term liabilities	$ 156,500	$ 134,261